2-Aminothiazole → Ethyl imidazo[2,1-b]thiazole-6-carboxylate
反応式
[NH2:1][C:2]1[S:3][CH:4]=[CH:5][N:6]=1.Br[CH2:8][C:9](=O)[C:10]([O:12][CH2:13][CH3:14])=[O:11]>COCCOC>[S:3]1[CH:4]=[CH:5][N:6]2[CH:8]=[C:9]([C:10]([O:12][CH2:13][CH3:14])=[O:11])[N:1]=[C:2]12参加物
4
実験手順
To the cold solution of 2-aminothiazole (0.5 g, 4.99 mmol) in 10 mL of DME was added ethyl bromopyruvate (0.783 mL, 6.24 mmol). The resultant mixture was stirred at RT for 30 min. The yellow precipitate obtained was filtered. The solid residue was dissolved in 20 mL of ethanol and refluxed for 8 h. After the completion of the reaction as evidenced by LC-MS, the solvent was removed under vacuum. Residue was added to DCM and washed with sodium bicarbonate solution. The organic solvent was evaporated and the crude product was purified by Combiflash. Yield 0.285 g. 1H NMR (400 MHz; CDCl3): δ 1.42 (t, 3H), 4.41 (q, 2H), 6.98 (d, 1H), 7.47 (d, 1H), 8.09 (s, 1H).